AD7237AAR-REEL7

Overview

The AD7237AAR-REEL7 is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead SOIC. It integrates on-chip voltage reference and output amplifiers, eliminating the need for external trimming. The device operates with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. It features an 8-bit parallel loading structure with double-buffered input latches, requiring two write operations per DAC channel. Typical settling time is 8 µs to within ±1/2 LSB, with power dissipation typically at 165 mW under single-supply conditions.

Feature Summary

• Dual 12-bit LC2MOS DACPORT architecture with integrated 5 V Zener reference and buffered outputs
• Parallel interface with double-buffered input latches: 8-bit LSB and 4-bit MSB segments loaded via CS, WR, A0, and A1
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)
• Typical settling time of 8 µs and data setup time of 30 ns

Applications

• Microprocessor-based data acquisition systems requiring dual-channel analog output
• Industrial process control loops utilizing 8-bit or 16-bit bus architectures
• Programmable power supplies and signal generators needing precise voltage references

Procurement Notes

Verify the specific suffix 'REEL7' indicates tape-and-reel packaging when sourcing components. Confirm that the 'A' grade meets the required accuracy specifications of ±1 LSB relative accuracy over the industrial temperature range of -40°C to +85°C. Ensure compatibility with the specified supply voltage tolerances of ±10% for this version.

Selection Notes

Select the AD7237A variant if the application requires an 8-bit microprocessor interface with double-buffered latches and asynchronous LDAC updates. Choose the AD7247A if a direct 12-bit parallel load structure with separate chip selects for each DAC is preferred. Both variants share identical electrical performance but differ in digital interface logic and pin assignments.

Part Context

This component belongs to the improved AD7237/AD7247 family, featuring extended supply voltage operation from 12 V to 15 V and faster interface times compared to previous generations. It is fabricated using Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic for high reliability and space efficiency in monolithic designs.

Replacement Considerations

The discontinued AD7237ABR is directly replaced by the AD7237ABRZ. For equivalent functionality with the same package and interface, consider the AD7237AAN (DIP) or AD7237ABN (DIP) variants. The AD7247A series offers a compatible alternative with a different parallel loading structure.